How to Select Front Door Type

[Holly64]

Hi
I currently have a wooden front door, it's bowing at the top and letting in a draft. I've decided to go for a new modern door - a composite door. Can someone advise me on what I should be looking for? I am worried about quality and don't know what I should be checking. I want it to be warm.

Grateful for advice.

 

[cross thread]

Regarding composite doors, we have had them in our last two homes, very secure but both have been replaced under guarantee they both faced south and got a lot of sun.